Noticed that my a/c light was flashing yesterday while my automatic climate control was on, weather is pretty cold so it was mainly using the compressor to clear the windows. Press the a/c button, light went out, press again it comes back on and stayed lit for a few seconds, then began flashing again. I am a Toyota automotive student so I have a "few tricks up my sleeve" and checked a few things and realized that the relay in the main relay/fuse box under the hood was definitely bad. Purchased a new one for about $30 and popped it in, works fine!!